Uh oh.
I am unfortunately having this exact same problem with the same bizlink/dell adapter. Frustrated as hell too. I am running a 5770.

Supposedly the best solution for this is using an AC to USB power brick (aka a wall outlet "wall wart" that gives you a usb port for charging). It seems that the USB on the Bizlink adapter gets Very unhappy when the power on the usb line fluctuates, even slightly.